TIGOR AMT

TIAGO/TIGOR AMT Gasoline DTC Troubleshooting Guide Version: 4.0 Date: 18-04-2017 Author: Sathi/Anupama Page: 240 of 427 Copyright © TATA MOTORS Ltd. This document must not be used in any way, such as copying and redistributing to third parties, without the consent of author. 76. P2908-01: Clutch System – Control error Overview: ISO Code P2908-01 Customer Symptom Transmission Fault Lamp ON No gearshifts, Vehicle not cranking, sudden shift to neutral while driving, engine stopping Fault Effects (On Vehicle) No gearshifts, Vehicle not cranking, sudden shift to neutral while driving, engine stopping Lamp Status (If Any) Transmission Fault Lamp ON Fault Detection Condition This fault gets detected after Ignition On in engine running condition if a sudden clutch closure is detected due to clutch command failure. Normal Operating Condition TCU monitors correct clutch closure response during controlled clutch closing phase. Probable Trouble Area Clutch Electro valve / TCU / Clutch Healing Condition Fault is cleared on next ignition Power ON Component Details: In an AMT system, the clutch is electro-hydraulically controlled by the TCU. Preliminary Checks: 1) Loose/ Damaged Valve body and TCU mountings. 2) Check for damage or back out of pins at TCU connector. 3) Check visibly for kit Oil leakage and ensure with diagnostic tool that kit oil pressure is in range 38 - 51 bar 4) Check for mechanical damage to the clutch housing, clutch actuator mechanical fitments 5) Check correct fitment of ground cable connections on vehicle chassis. Trouble Shooting:- Step Checks IF YES IF NO 1. Check the clutch assembly and AMT clutch lever interface for mechanical damage, stuck particle, lubrication loss etc? Go to Step 2 Rectify/replace the component 2. Check clutch electrovalve electrical connections by following same procedure as for DTC – P0900. Are electrical connections OK? Go to Step 3 Establish continuity by rectifying harness connections as per the circuit schematic 3. Using TCU diagnostic tool, initiate clutch actuation routine.Monitor “clutch position Actuator” Variable and confirm that it changes from engaged (~xxx mm) to disengaged (yyy mm) position. (Alternately visibly check the clutch lever movement with actuation command.) Is the clutch engaging and disengaging freely? Recheck the above steps Replace clutch release linkage Replace the valve body (Mechatronic gear Actuator), if fault persists then Replace Kit DTC’s confirmation:- After rectification, clear all DTC’s and ensure the following points by referring TCU parameters using TML diagnostic tool before handing over to customer.